Isolated FeN₄ Sites for Efficient Electrocatalytic CO₂ Reduction

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Isolated metal sites are promising for efficient electrocatalyst design.
• Electrochemical conversion of carbon dioxide (CO2) is crucial for sustainable energy.

Purpose of the Study:

• To develop an efficient electrocatalyst for CO2 reduction.
• To investigate the role of isolated FeN4 sites in CO2 conversion.

Main Methods:

• Fe-doped graphitic carbon nitride synthesized via adsorption.
• Confined pyrolysis strategy to create isolated FeN4 sites.
• Electrochemical CO2 reduction reaction (CO2RR) studies.

Main Results:

• Isolated FeN4 sites were successfully synthesized, preventing metal atom agglomeration.
• The FeN4 sites lowered the energy barrier for key intermediates in CO2RR.
• Enhanced selectivity for CO production with a high Faradaic efficiency of 93% was achieved.

Conclusions:

• The confined pyrolysis strategy effectively generates isolated FeN4 sites for CO2 electroreduction.
• Isolated FeN4 sites significantly enhance CO2 conversion efficiency and selectivity toward CO.
• This approach provides a viable pathway for designing advanced electrocatalysts.